Buggy code:
private JDatePickerImpl datePicker ; private JLabel title ; private JLabel idShower ; private JLabel nameLbl ; private JTextField clientName ; private JTextField clientPhone ; private JLabel phoneLbl ; private JCheckBox jCheckBox1 ; private JCheckBox jCheckBox2 ; private JTable contentTable ; private JLabel totalLbl ; private JTextField totalAmount ; private JPanel contentPane ; public static void main ( String [ ] args ) { } public DRNoteForm ( ) { } private void initComponents ( ) { setTitle ( "Liquid" ) ; setSize ( 700 , 500 ) ; setResizable ( false ) ; setLocationRelativeTo ( null ) ; setDefaultCloseOperation ( WindowConstants . EXIT_ON_CLOSE ) ; contentPane = new JPanel ( ) ; contentPane . setBorder ( new EmptyBorder ( 5 , 5 , 5 , 5 ) ) ; setContentPane ( contentPane ) ; contentPane . setLayout ( null ) ; UtilDateModel model = new UtilDateModel ( ) ; Properties p = new Properties ( ) ; p . put ( "text.today" , "Today" ) ; p . put ( "text.month" , "Month" ) ; p . put ( "text.year" , "Year" ) ; JDatePanelImpl datePanel = new JDatePanelImpl ( model , p ) ; datePicker = new JDatePickerImpl ( datePanel , new DateLabelFormatter ( ) ) ; jRadioButton1 = new JRadioButton ( "Entrega" ) ; jRadioButton2 = new JRadioButton ( "Recepcion" ) ; ButtonGroup bg = new ButtonGroup ( ) ; bg . add ( jRadioButton1 ) ; bg . add ( jRadioButton2 ) ; title = new JLabel ( "NOTA" ) ; title . setFont ( new Font ( "Arial" , Font . PLAIN , 40 ) ) ; idShower = new JLabel ( "Nº<seq2seq4repair_space>000001" ) ; idShower . setFont ( new Font ( "Courier<seq2seq4repair_space>New" , Font . PLAIN , 20 ) ) ; nameLbl = new JLabel ( "Señor(es)" ) ; clientName = new JTextField ( ) ; phoneLbl = new JLabel ( "Telf//Cel" ) ; clientPhone = new JTextField ( ) ; String [ ] columnNames = new String [ ] { "Cod" , "Cant." , "Unidad" , "Descripcion" , "Precio<seq2seq4repair_space>Unit." , "Precio" } ; Object [ ] [ ] tempData = new Object [ ] [ ] { new Object [ ] { "00126" , 20 , "Kg." , "Electrodo<seq2seq4repair_space>7018<seq2seq4repair_space>1//8" , 22.8 , 456 } , new Object [ ] { "00119" , 20 , "Kg." , "Electrodo<seq2seq4repair_space>6013<seq2seq4repair_space>1//8" , 22.8 , 456 } } ; contentTable = new JTable ( tempData , columnNames ) ; contentTable . setFont ( new Font ( "Arial" , Font . PLAIN , 20 ) ) ; contentTable . setRowHeight ( 25 ) ; contentTable . getColumnModel ( ) . getColumn ( 0 ) . setPreferredWidth ( 60 ) ; contentTable . getColumnModel ( ) . getColumn ( 1 ) . setPreferredWidth ( 40 ) ; contentTable . getColumnModel ( ) . getColumn ( 2 ) . setPreferredWidth ( 50 ) ; contentTable . getColumnModel ( ) . getColumn ( 3 ) . setPreferredWidth ( 280 ) ; contentTable . getColumnModel ( ) . getColumn ( 4 ) . setPreferredWidth ( 70 ) ; contentTable . getColumnModel ( ) . getColumn ( 5 ) . setMinWidth ( 20 ) ; contentTable . setAutoResizeMode ( JTable . AUTO_RESIZE_LAST_COLUMN ) ; JScrollPane tablejs = new JScrollPane ( contentTable ) ; totalLbl = new JLabel ( "Total" ) ; totalAmount = new JTextField ( ) ; double total = 0 ; for ( int i = 0 ; i < ( contentTable . getRowCount ( ) ) ; i ++ ) { total += Double . parseDouble ( contentTable . getModel ( ) . getValueAt ( i , 5 ) . toString ( ) ) ; } totalAmount . setText ( String . valueOf ( total ) ) ; jCheckBox1 = new JCheckBox ( "x<seq2seq4repair_space>Cancelar" ) ; jCheckBox2 = new JCheckBox ( "x<seq2seq4repair_space>Facturar" ) ; jButton1 = new JButton ( ) ; jButton1 . setText ( "OK" ) ; title . setBounds ( 300 , 50 , 150 , 30 ) ; datePicker . setBounds ( 300 , 120 , 150 , 30 ) ; idShower . setBounds ( 500 , 120 , 150 , 30 ) ; jRadioButton1 . setBounds ( 550 , 60 , 100 , 30 ) ; jRadioButton2 . setBounds ( 550 , 80 , 100 , 30 ) ; nameLbl . setBounds ( 40 , 160 , 150 , 30 ) ; clientName . setBounds ( 100 , 160 , 350 , 30 ) ; phoneLbl . setBounds ( 465 , 160 , 150 , 30 ) ; clientPhone . setBounds ( 510 , 160 , 150 , 30 ) ; tablejs . setBounds ( 30 , 210 , 640 , 150 ) ; totalLbl . setBounds ( 540 , 360 , 50 , 30 ) ; totalAmount . setBounds ( 570 , 360 , 100 , 30 ) ; jCheckBox1 . setBounds ( 250 , 370 , 100 , 30 ) ; jCheckBox2 . setBounds ( 350 , 370 , 100 , 30 ) ; <START_BUG> jButton1 . setBounds ( 350 , 420 , ( - 1 ) , 30 ) ; <END_BUG> getContentPane ( ) . add ( title ) ; getContentPane ( ) . add ( datePicker ) ; getContentPane ( ) . add ( idShower ) ; getContentPane ( ) . add ( jRadioButton1 ) ; getContentPane ( ) . add ( jRadioButton2 ) ; getContentPane ( ) . add ( nameLbl ) ; getContentPane ( ) . add ( clientName ) ; getContentPane ( ) . add ( phoneLbl ) ; getContentPane ( ) . add ( clientPhone ) ; getContentPane ( ) . add ( tablejs ) ; getContentPane ( ) . add ( totalLbl ) ; getContentPane ( ) . add ( totalAmount ) ; getContentPane ( ) . add ( jCheckBox1 ) ; getContentPane ( ) . add ( jCheckBox2 ) ; getContentPane ( ) . add ( jButton1 ) ; } private void setStyle ( ) { } }

Fix:
jButton1 . setBounds ( 350 , 420 , 50 , 30 ) ;